Ripped models shows weird lines like this
The objects with the lines are blender objects that are called empties. They represent a single point and orientation in space, and are generally used as a marker for something else.

In this case, looking at their positions, I would guess that your importer is importing the bones in the mesh as empties, so these actually mark the bone positions. If this is the case you will probably see that many of the empties are parented to each other in a similar hierarchy as bones would be.